6200' over 100 miles. This particular ride was ~60% gravel, but most of the elevation gain was gnarly gravel climbs and rollers.
On a single speed fixed gear (running fixed not freewheel at the time), my max was 4600' on a solo 103 mile ride.
Looks like I gotta step it up! I'd like to do a 10,000' ride, and there's a local century route that nails it.